Loss - The volatile liquids such as petrol , diesel , kerosene etc evaporated if
the packaging wasn't airtight. Dust , hair , fibers etc may be lost during packaging
so extra care should be taken by investigation officer.
Contamination - During packaging of evidences the ingress of any foreign matter
contaminated the exhibit. The investigation officer also look out the role of
environment as wind and rain added to the contamination of evidences.
Deterioration - Chances of deterioration of biological evidence such as blood ,
semen etc are high in hot and humid climate , so the quickly collect and pack
these evidences and hastily proceed them to the lab.
Tempering - Tempering exist if evidences are not properly and securely packed .
The investigation officer not let it unattended .
Some precautions should be taken by the investigation officer during the
preservation of physical evidence as......
1) There's always a risk of transferring hairs , fibers and biological fluids ,
so the investigation officer always wear gloves and take other precautions that needed.
2) Dust , pollens are micro-traces evidences , they always collected by soft brush on a
paper. Hair , fibers etc always pick up by a rubber tip forceps.
3) For biological evidences like blood , semen , vomit etc , a spatula probe or spoon
always be used. For chemicals and corrosive liquids glass spoon is perfect.
4) Materials like bottles , cup , glass etc having chances of fingerprints therefore they
always be examine and pick up by fingers at the top and bottom . Knife and other
weapons are also handled by grasping from the tip of index finger.
5) Rubber tip forceps are used for documents lifting .
6) Rubber tip forceps are used for fired bullets , empty cartridges , wads etc
.
7) Brush , dustpan and forceps are used to collect broken glass.
container otherwise it may be spoiled. If paper bags are used then first dry the evidence
in room shadow .
.
11) Digital evidence like computers and mobile phones should be switched off and take precautions for their safety of information.
However it is true that some amount of material may be lost in the analytical process but when we handle carefully the preservation of evidence will be better for future presentation of evidence in court of law.
